Q. A normal visioned man whose father was colour blind marries a woman whose father was also colour blind. They have their first child as a daughter. What are the chances that this child would be colour blind :

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Q. A normal visioned man whose father was colour blind marries a woman whose father was also colour blind. They have their first child as a daughter. What are the chances that this child would be colour blind :

Q. A normal visioned man whose father was colour blind marries a woman whose father was also colour blind. They have their first child as a daughter. What are the chances that this child would be colour blind :

  1. 100 %
  2. Zero percent
  3. 25 %
  4. 50 %

Solution :

Correct option : B Colour blindness is an X-linked disease. So, woman whose father was color blind will be carrier for the disease.
After looking at the crosses, the daughter born to them can be either normal or carrier for the disease, but the possibility of colour blindness is zero percent.
So, the correct option is ‘Zero percent’.

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